Stormtroopers are supposed to decap a point in conjunction with the decap stuka and have Close the Pocket wipe the map of your opponent. They aren't meant to pop out amidst combat and decrew a few ATGs or mortars.
Stormtroopers were designed specifically around the Encirclement commander. Utilizing them outside of scope of that commander (until they're in more commanders) is probably going to be ineffective.
But they aren't so expensive to reinforce, which is nice. If anything access to an LMG42 as an alternative to the STGs would be equally enjoyable for the unit.
Probably be too much though.
Yeah, not expensive to reinforce, but expensive to equip and call...